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Derivatives of vinylidene fluoride as components of liquid crystal medium and their preparation methods and applications

A technology of reaction and compound, which is applied in the field of difluoroethylene derivatives as components of liquid crystal media and its preparation and application, and can solve problems such as weak negative dielectric anisotropy

Active Publication Date: 2014-10-29
JIANGSU HECHENG DISPLAY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, these fluorinated vinylidene fluoride derivatives have positive or weakly negative dielectric anisotropy

Method used

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  • Derivatives of vinylidene fluoride as components of liquid crystal medium and their preparation methods and applications
  • Derivatives of vinylidene fluoride as components of liquid crystal medium and their preparation methods and applications
  • Derivatives of vinylidene fluoride as components of liquid crystal medium and their preparation methods and applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] The synthetic route of the prepared compound 3IV (2F) EWO2 is as follows:

[0113]

[0114] Its specific process steps are as follows:

[0115] 1) Synthesis of 3IV(2F)EWO2-2

[0116] Add 5.76g of Mg powder and 0.05g of iodine into a 500mL three-necked flask, 10mL of tetrahydrofuran (THF), and protect with nitrogen. Dissolve 47.4g of 3IV(2F)EWO2-1 (commercially available intermediate) compound in 200mL tetrahydrofuran solution, slowly add the tetrahydrofuran solution of 3IV(2F)EWO2-1 compound to the above reaction system, and wait for the reaction to start , continue to dropwise add the THF solution of the remaining 3IV(2F)EWO2-1 compound, after the dropwise completion, keep the system under slight boiling and reflux for 3h, and cool to room temperature. 40g of chlorotrifluoroethylene was slowly passed into the cooled reaction system, and stirred at room temperature for 12h. The reaction was quenched with dilute hydrochloric acid, extracted with ethyl acetate, the ...

Embodiment 2

[0133] The synthetic route of the prepared compound 2IV (2F) EPWO is as follows:

[0134]

[0135] Its specific process steps are as follows:

[0136] 1) Synthesis of 2IV(2F)EPWO2-9

[0137] Add 5.76g of Mg powder and 0.05g of iodine into a 500mL three-necked flask, 10mL of tetrahydrofuran (THF), and protect with nitrogen. Dissolve 44.6g of 2IV(2F)EPWO2-8 (commercially available intermediate) compound in 200mL tetrahydrofuran solution, slowly add the tetrahydrofuran solution of 2IV(2F)EPWO2-8 compound to the above reaction system, and wait for the reaction to start , continue to add dropwise the remaining THF solution of the compound of 2IV(2F)EPWO2-8, after dropping, keep the system slightly boiling and reflux for 3h, and cool to room temperature. 40g of chlorotrifluoroethylene was slowly passed into the cooled reaction system, and stirred at room temperature for 12h. The reaction was quenched with dilute hydrochloric acid, extracted with ethyl acetate, the organic phas...

Embodiment 3

[0153] The synthetic route of the prepared compound 2IV (2F) EWP3 is as follows:

[0154]

[0155] Its specific process steps are as follows:

[0156] 1) Synthesis of 2IV(2F)EWP3-9

[0157] Add 5.76g of Mg powder and 0.05g of iodine into a 500mL three-necked flask, 10mL of tetrahydrofuran (THF), and protect with nitrogen. Dissolve 44.6g of the 2IV(2F)EWP3-8 (commercially available intermediate) compound in 200mL THF solution, slowly add the THF solution of the 2IV(2F)EWP3-8 compound to the above reaction system, and wait for the reaction to start , continue to dropwise add the remaining THF solution of the compound of 2IV(2F)EWP3-8, after the dropwise completion, keep the system under slight boiling and reflux for 3h, and cool to room temperature. 40g of chlorotrifluoroethylene was slowly passed into the cooled reaction system, and stirred at room temperature for 12h. The reaction was quenched with dilute hydrochloric acid, extracted with ethyl acetate, the organic phase...

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Abstract

The invention provides a polyvinylidene floride derivative with a general formula (1) taken as a liquid crystal medium component, and a preparation method and application thereof. The derivative is a negative liquid crystal compound and has big dielectric anisotropic absolute value, proper optical anisotropy, high clearing point and wider nematic phase temperature range; and a display applying the derivative has quicker response speed and wider working range and can keep good display in various environments. The invention also provides one or more liquid crystal composition(s) including the derivative and a liquid crystal element including the liquid crystal composition (s).

Description

technical field [0001] The present invention relates to vinylidene fluoride derivatives as components of liquid crystal media, their preparation and use. Background technique [0002] Liquid crystal materials are substances with a liquid crystal phase between a solid phase and a liquid phase, and are mainly used as dielectrics in displays because the optical properties of such substances can be changed by an applied voltage. Electro-optic devices based on liquid crystals are well known to those skilled in the art, in which various effects may be incorporated. These effects are applied to liquid crystal display elements, and can be divided into PC (phase change, phase change), TN (twist nematic, twisted nematic), STN (super twisted nematic, super twisted nematic), ECB according to the display mode of liquid crystal (electrically controlled birefringence, electrically controlled birefringence), OCB (optically compensated bend, optical compensation bending), IPS (in-plane swit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/65C07C67/08C07C43/225C07C41/30C09K19/32G02F1/13
Inventor 刘琦谭玉东王俊智
Owner JIANGSU HECHENG DISPLAY TECH CO LTD
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